All grown up, Dean's powers are fully manifested and trained. He is deeply rooted in New York, so deeply that traveling elsewhere is somewhat painful without proper prep to withdraw his power. He lives with his lover/best friend, Theo. They get by because of a spell that basically makes counterfeit money for them.
When he does work, Dean tends to do odd jobs or be a bike messenger. He uses his magic to help him get around the city quickly and safely. He also does a lot of work at motorcycle garages, fixing up motorcycles and learning how to paint, fabricate and weld. He doesn't have a permanent job at a garage simply because he doesn't want to work full time.
Since he doesn't work, Dean spends a lot of time hanging out with other sorcerers. He's most often found at his friend's tattoo shop. He builds magic wards and helps mix magic inks. It's not where his magical talents lie, but he's proficient at it. His talents are in electrical and telecommunication magic. It's through his sorcerer friends that he's really learned the ins and outs of working magic in New York.
To Dean, his greatest magical accomplishment are his tattoos. He has designed each and every one along with the magic that's in them. The first he made was a defensive ward on his right shoulder. It looks like a flower and when something or someone hits Dean, it blooms to absorb the damage and keep him from getting hurt. Then he got a protective ward in the shape of a tiger. It comes to life when there is danger, most often pacing across his chest. It can leap off his skin for a few seconds to give Dean time to counter attack. The bird on his chest was last. It can literally leave Dean's skin and soar above the city with Dean's consciousness in it. The rest of his tattoos are purely decorative. He likes being inked.
A near constant night owl, Dean goes out all the time. He loves the clubs, but his favorites are the underground music clubs. He's somewhat infamous in many of them for taking over the light show part of things. He'll also change the music if he doesn't like it. Sometimes people are okay with it, sometimes he gets kicked out. But it's also given him a reputation for being a guy people can go to. Dean's free with using his powers to fix things or help people. He's not officially part of the group that protects New York, but one day, maybe.
All and all, he's come a long way from the jaded, slightly bitter teenager he was. He is happy, confident and has mellowed considerably. He's still just as loyal as he was before, but he's more inclined to laugh and smile, to have a good time and make new friends. He never wants to leave New York and the life he's made for himself.
[OOC: Adult!Dean is open for verses. This is just his canon for his adult verse. He's completely flexible when interacting with other muses. All images found on Tumblr and are not by me.]